General Motors Atlas Vortec 4200 T4 Exhaust Manifold
Atlas / Vortec 4200 T4 with divided single 50mm wastegate!
Not one person asked for this! BUT, I think this engine has not received the attention it deserves.
We have been working with @nivlac57 and @motionautotv. The 4200 Straight 6 from @generalmotors was released in a Blazer, but the ability for this engine to hold itself together at now over 700whp through an auto has been documented by Calvin over at the Nivlac57 YouTube Chanel. We have designed this and tested on a number of chassis to allow easy fitment in LHD builds. This has been designed to accept up to the larger frame @garrettmotion G45's, @precisionturbo 75's and 85's as well as @borgwarnerboosted S400's. Again we have machined the manifold to suit a @turbosmarthq 50mm wastegate, but can run a 60 if you cut the flange off (as the runner is designed to flow the 60).